Measurement and Computational Modeling of Radio-Frequency Electromagnetic Power Density Around GSM Base Transceiver Station Antennas.

Evaluating the power densities emitted by GSM1800 and GSM900 BTS antennas is conducted via two methods. Measurements are carried out in half a square meter grids around two antennas. CST Microwave STUDIO software is employed to estimate the power densities in order for detailed antenna and tower modeling and simulation of power density. Finally, measurements obtained from computational and experimental methods were compared through the contour lines using the statistical Surfer software. After measuring and simulating all values, it turns out that power density is generally lower than the permissible exposure limits although exceeds the limits in some sample points . According to the measurements, simulation error in stations GSM900 and GSM1800 are 10% and 8%, respectively. Findings from contour-line-maps illustrates that direct measurement method follows the same emission pattern as the computational method does. It validates the computational approach and the models attained for BTS power density estimation.